Effect of Fuel Impurity on Structural Integrity of Ni-YSZ Anode of SOFCs

Wenning Liu, Xin Sun, Olga Marina, Larry Pederson, Moe Khaleel

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Electricity production through the integration of coal gasification with solid oxide fuel cells (SOFCs) may potentially be an efficient technique for clean energy generation. However, multiple minor and trace components are naturally present in coals. These impurities in coal gas not only degrade the electrochemical performance of Ni-YSZ anode used in SOFCs, but also severely endanger the structural integrity of the Ni-YSZ anode. In this paper, the effect of trace impurity in coal syngas on the mechanical degradation of Ni-YSZ anode was studied by using an integrated experimental/modeling approach. Phosphorus is taken as an example of impurity. Anode-support button cell was used to experimentally explore the migration of phosphorous impurity in the Ni-YSZ anode of SOFCs. X-ray mapping was used to show elemental distributions and new phase formation. The subsequent finite element stress analyses were conducted using the actual micro structure of the anode to illustrate the degradation mechanism. It was found that volume expansion induced by the Ni phase change produces high stress level such that local failure of the Ni-YSZ anode is possible under the operating conditions.

Original languageEnglish
Title of host publicationAdvances in Materials Science for Environmental and Nuclear Technology II
PublisherJohn Wiley and Sons Inc.
Pages87-100
Number of pages14
Volume227
ISBN (Print)9781118144527, 9781118060001
DOIs
Publication statusPublished - 9 Sep 2011
Externally publishedYes

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Keywords

  • Coal gasification
  • Electrochemical performance
  • Fuel impurity
  • Solid oxide fuel cells
  • Structural integrity

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

Cite this

Liu, W., Sun, X., Marina, O., Pederson, L., & Khaleel, M. (2011). Effect of Fuel Impurity on Structural Integrity of Ni-YSZ Anode of SOFCs. In Advances in Materials Science for Environmental and Nuclear Technology II (Vol. 227, pp. 87-100). John Wiley and Sons Inc.. https://doi.org/10.1002/9781118144527.ch10